Antoine Pitrou <[EMAIL PROTECTED]> added the comment:

Yes, you must use y* instead: see
http://docs.python.org/dev/3.0/c-api/arg.html

y# would not be safe to use with bytearray since another thread could
mutate the bytearray in-between, possibly reallocating the internal
buffer (to shrink or grow it), and lead to a segfault when your thread
uses the obsolete pointer.

IMO, the documentation should mention that the '*' codes (y*, s*, etc.)
must be used in preference to the '#' codes, which are there for
backwards compatibility.

----------
assignee:  -> georg.brandl
components: +Documentation
nosy: +georg.brandl, pitrou
title: bytearray incompatible with bytes -> bytearray incompatible with y#
versions: +Python 2.6

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Python tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue3753>
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